Toothbrush



FIG. 1 is a perspective view of my ornamental design for a toothbrush;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 5 is an end view thereof as seen from the left side of FIG. 3; and,

FIG. 6 is an end view thereof as seen from the right side of FIG. 3.

The bristles shown in phantom or broken lines in the FIGS. form no part of the claimed design and are included only to illustrate an environment. 

The ornamental design for a toothbrush, as shown and described. 